Improvement in chills for casting chilled rolls



ROBERT TOLMIE( 'ehis for Casting ch'i edR'o-s.

Patented Feb. 20, 1872.

UNITED STATES PATENT rron ROBERT TOLMIE, OF WILMINGTON, DELAWARE, ASSIGNOR TO GEORGE Gr. LOBDELL AND WILLIAM STUART, OF SAME PLACE.

IMPROVEMENT IN CHILLS FOR CASTING CHILLED ROLLS.

Specification forming partof Letters Patent No. 123953, dated February 20, 1872.

Specification describing Improvement in Ghills for Casting Chilled Rolls, invented by- ROBERT TOLMIE, of Wilmington, New Castle County, Delaware.

scribed hereafter, so that the chill can be made -to accommodate itself to the contraction of the roll, thereby obviatin g the tendency which the contraction has to tear off thenecks of the rolls.

In the accompanyin g drawing, Figures 1 and 2 are vertical sections, representing sufficient of a chill for casting chilled rolls to illustrate my invention; Fg. 3, an exterior view; and Fig. 4, a plan view with the upper portion of the chill removed.

The chill is composed, as usual, of a number of cast-iron cylindrical sections fitted together, as shown in the drawing. Between an npper section, A, and a lower section, A', of the chill intervene segmente-1 blocks D, three being shown in the present instance, and these blocks are wedge-shaped, as shown in Figs. l and 2, to pernit their easy withdrawal, in a manner and for a purpose explained hereafter.

When the chill is being prepared for receiving the molten iron, the blocks are placed in the position shown in Fig. l, so as to elevate the sectionA above the section A', the blocks which form part of the chill being retained in place, in the present instance, by a hook connected to one block, fitting with its bent end into the staple in the adjoining block; other fastening devices may, however', be adopted for attaining the same end. After the chill has been filled, in the nsual mannr, with molten metal, the latter contracts in cooling, and, if no pro- Vision is made to acconnodate the mold to this contraction,.the separation of the casting at the neck of the roll is liable to take placean evil which ny invention has been designed to obviate.

After the metal in the chill has become set-, and before the rapid contraction conmences, I detach the blocks D, thereby leaving a vacancy between the two sections A and A' of the chill, so that the latter can contract with the casting to the eXtent of this vacancy, which may be such as to compensate for the entire contraction of the roll. By

erniitting a contractile chill to thus acconmodate itself to the oontraction of the casting, the difficulty above mentioned is effectally obviated.

It is immaterial how many blocks D are used, or of what shape they are made, providing they form, when in their places, a part of the chill, and providing they can be easily detached.

I claim as ny inventioni A chill for casting chilled rolls made in sections, and rendered contractile by detachable blocks forming part of the chill, all snbstantially in the manner described.

In testimony whereof I have signed nynane to this specification in the presence of two subscribing witnesses.

ROBERT TOLMIE.

Witnesses A. MGLEOD, JNO. HENRY PUHL. 

